body h1,
body h2,
body h3,
body h4 {
    width: 90%;
    text-align: center;
    margin: 0 auto 20px;/*上0 左右居中 下20*/
    padding:20px 0px 10px 0px;
    border-bottom: 1px solid #ddd;
    color:black;
}
body p,
body blockquote {
    color: black;
}
.container{
    width: 40%;
    background-color: white;
    /*text-align: center;*/
    margin: 0 auto;	/*外边框上下0 左右相等即居中	4参数上右下左*/
    border-radius: 15px;
    box-shadow: 5px 5px 5px #ddd;
}
.container .dl{
    width:90%;
    margin: 10px auto 0px;
    text-align: center;
}
.container .dt{
    width:20%;
    text-align: right;
}
.container .dd{
    text-align: left;
    position: relative;/*相对定位*/
    width:70%;
    top:-20px;
    /*margin-left: 38%;*/
    padding-left: 18%;
}
.container .btn{
    /*box-sizing: 包括边框*/
    width: 200px;
    height:43.5px;
    text-align: center;
    margin: 0 auto;/*上20 左右居中 下0*/
}
.search #in{
    width:70%;
    height:34px;
    border:1px solid black;
    outline:none;
    font:14px/30px "microsoft yahei";
}
.search .btn_search{
    background:green;
    width:80px;
    height:34px;
    color:white;
    border:none;
    outline:none;
    font:14px/34px "microsoft yahei";
    text-align: center;
}